Pavement breaking equipment



`lune 21, 1938. C. o. FINN 2,121,480

' PAVEMENT BREAKING EQUIPMENT `Filed Nov. 19, 1936 3 Sheets-Sheet l sa l39 Il FIGA. 5|

lo 7 2| 6 6e /NI/ENTo/e I4 CHARLES o.F|NN

A TTORNEYS HG2., BY

June 2l, 1938. c. o. FINN 2,121,480

' PAVEMENT BREAKING EQUIPMENT Filed Nov. 19, 1956 5 Sheets-Sheet 2IIIIIIIIIIIHHI Hlm .6 Flay?.

-l/v VENTO/e 4 CHARLES o.F|NN

A TTORNE ys June 21, 193s'.

C. O. FINN PAVEMENT BREAKING EQUIPMENT Filed Nov. 19, 1936 3Sheets-Sheet 3 FIGA.

/NVENTOR CHARLES O.FINN mw 4MM ATTORNEYS Patented June 21, 1938 `Charles(L Finn, Cincinnati, Chio, assigner to Novo Engine Company, Lansing,Mich., a corporation of Michigan Application November 19, 1936, SerialNo. 111,712

12 Claims.

This invention relates generally to apparatus for demolishing concreteor other types of pavement and refers more particularly to apparatus ofthis character embodying the drop hammer principle.

One of the principal objects of this invention is to simplify, rendermore efficient, and reduce the cost of equipment of the above type byproviding a construction sufficiently compact and Figure 5 is a crosssectional view taken substantially on the plane indicated by the line 55 of Figure 4;

Figure 6 is an end elevational view of the drop hammer showing a cuttingdevice in association therewith; and

Figure '7 is a side elevational view of the construction shown in Figure6. g

In Figure 1 of the drawings, I have shown my 10 light in weight topermit readily supporting the improved pavement breaking equipment assame on a relatively small low capacity truck mounted on a relativelysmall capacity truck chassis. chassis Ill in rear of the`drivers cab II.The

Another object of this invention resides in the truck chassisillustrated is a standard 11/2 ton provision of a truck attachment ofthe character model, and my improved equipment may be sup- 15 ser forthwhich is suncienuy iight in weight to ported on the frame l2 of thechassis without a1- perinit the several parts thereof to be mounted astering, or otherwise interfering, with the original a unit on arelatively light, fast truck, and which design or construction of thechassis. In accordis equipped with a hammer possessing the weight ancewith conventional practice, the frame I2 required to effectively breakup pavement. comprises longitudinally extending laterally A furtherfeature of this invention resides in spaced side sills i3 suspended fromtherear axle the provision of a pavement breaker, equipped Ill of thetruck in the usual manner by suitable with a gravity actuated hammerhaving a resemi-elliptical springs I5. The forward end of movable nosecapable of .being readily interthe frame i2 is suspended from thefrontaxle of changed for different types of nose pieces or for thevehicle by suitable springs (not shown), and

a cutting device designed to trim certain types the motor for propellingthe truck, as Well as the of pavement. drivers cab Il, is supported onthe forward end In addition to the foregoing, this invention of theframe I 2. contemplates an attachment having a vertically The pavementbreaking equipment is shownin extending guide for the hammer movablefrom the several gures as having a base in the form `an upright positionperpendicular to the chassis of a frame Iii embodying longitudinallyextendframe to a position substantially parallel to the ing side sillsIl secured together in lateral spaced latter. This feature isadvantageous' in that it relationship at the frontland rear ends bycross provides for obtaining the necessary clearance members I8 and I9,respectively. The side sills above the vehicle during transportation ofthe Il are spaced from each other a distance cori equipment, and alsopermits storing the vehicle responding to the lateral spacing of theside sills in a building of normal size. .I3 of the chassis frame i2,and are supported With the foregoing, as well as other objects indirectly upon the sills I3 in, the manner clearly view, the inventionresides in the novel conshown in Figure 3. In the interest of rigidity,struction of the pavement breaking equipment the side sills Ill are inthe form of I beams, and

40 and this construction will be made more apthe transverse members I8and I9 are substanparent as the description proceeds, especially tiallychannel-shaped in cross section. The ends when considered in connectionwith the accomof the cross members extend laterally outwardly panyingdrawings, wherein:- beyond opposite sides of the frame I6 and are Figure1 is a perspective view of atruck chassis preferably welded to the endsof the sills I1 to `4.5"having pavement breaking equipment constructedprovide an integral construction. Any suitable in accordance With thisUVrlOn; l means may be resorted to for securing the frame Fglll@ 2 iS afragmentary side elevational view I in assembled relation with thechassis frame of the construction shown in Figure 1 and illusl2 and, inthe present instance, this is accomtrating the vertical extension in itsfolded posipushed by baiting the bottom flanges of the sills tion; Il tothe top flanges of the sills I3 forming struc- Figure 3 is an endelevational View of the pavetural parts of the chassis frame I2. mentbreaking equipment showing the drop ham- The drop hammer 2li of theequipment is supmel irl its raised DOSOII; ported for vertical sliding1movement on the Figure Ii is an enlarged side elevational view frame i6rearwardly of the axle I4 and midway ofthe drop hammer assembly; betweenthe rear ground engaging wheels 2| mounted on the extremities of theaxle I4. With this arrangement, the hammer is permitted to fall intoengagement with the road surface without interference from any part ofthe truck chassis. In the present instance, the hammer is guidedthroughout its vertical movement by means of a pair of verticalstanchions 2| and 22 secured at their lower ends to the frame I6 inlateral spaced relationship. It will be observed from Figure that thestanchions are substantially channel-shaped in cross section and aresecured to the frame I6 with the channels opening outwardly.

In order to provide for reducing the height of the stanchions when theequipment is being transported by the truck, each of the stanchions isformed of two sections 23 and 24. It will be observed from Figure 1 thatthe upper ends of the lower sections 23 are secured together in properspaced relationship by means of a frame 25 having longitudinallyextending outwardly opening channel members 26 interconnected at therear ends by means of a transverse member 21 rigidly secured to the freeends of the rear cross member I9 of the frame I6 by means of thediagonal braces 28. The members 26 extend forwardly on opposite sides ofthe stanchions and are rigidly secured to the outer sides of the latterby means of the spacers 29. The forward ends of the side members 2Bextend beyond the corresponding sides of the stanchions and areconnected by means of a hinge pin 30. The hinge pin, in turn, isconnected to a frame 3| similar to the frame 25 and secured to the lowerends of the sections 24 of the stanchions, with the result that theupper sections 24 may be swung from the vertical position thereof shownin Figure 1 to the horizontal position of the same illustrated in Figure2. It will be noted from the latter iigvure that the sections 24 aresupported in a horizontal position from the frame I6 by a standard 32secured to and extending upwardly from the frame I6. In detail, theforward ends of the longitudinal side members 33 of the frame 3| areconnected to the hinge pin 30 by means of the brackets 34, and the rearcross member V35 of the frame 3| is detachably secured to the upperextremities of the diagonal braces 28 by means ofthe nuts and bolts 36.The side members 33 are secured to the outer sides of the sections 24 bymeans of the spacers 31 in order to effectively hold the lower ends ofthe sections 24 in proper spaced relationship, and the upper ends of thelatter sections are secured together by means of a transverse brace 38having the extremities thereof respectively connected to the oppositeends of the front cross member I8 of the frame I6 by means of the rods39. The opposite ends of the rods 39 are readily detachably secured totheir respective cross braces by means of fastener elements 4|) in theform of nuts and bolts. With the above arrangement, it will be notedthat the sections 24 of the stanchions are rigidly held in their uprightpositions and may be readily moved to the horizontal position shown inFigure 2 by merely detaching the upper ends of the diagonal braces 28'from the frame 3| and by removing the rods 39.

The hammer 20 is supported between the stanchions for sliding movementlongitudinally of the latter and, as shown in Figure 5, is formed withrecesses 4I in opposite sides of suicent dimension to slidably receivethe side flanges of the stanchions 2| and 22. Referring now to Figures 3and 4, it will be noted that the sides of the hammer 28, adjacent thesides having the recesses, are also recessed, as at 42, to receive the Ubolts 43 having the lower ends projecting below the hammer 26 forattachment to the nose 44 of the hammer. The nose 44 is shown in Figures1 to 5, inclusive, as designed to actually break pavement, although itwill be understood from Figures 6 and 7 that this nose may beinterchanged with a steel cutting knife 45 in the event it is desired toemploy the equipment for trimming the edges of the pavement.

In the present instance, the hammer 20 is moved upwardly along thestanchions by means of a suitable hoist 46 and is permitted to drop bygravity into engagement with the pavement. The hoist 45 is ofconventional construction comprising a drum 41 journalled upon the frameI6 for rotation about an axis extending transversely to the side sillsI1 of the frame, and isconnected to a prime mover 48 also mounted on theframe I6. in the present instance, the prime mover 443 is in the form ofan internal combustion engine supported upon the frame I6 with the driveshaft thereof extending parallel to the axis of the drum and connectedto an intermediate shaft 49 by the belt and pulley arrangement indicatedin Figure Il by the reference character 50. The intermediate shaft 49 isjournalled on the frame I6 and is connected to the drum 41 in the usualmanner by reduction gearing. It will be observed from Figure 4 that oneend of the ham mer actuating cable 5I is secured to the drum 41 of thehoist, and the other end is reeved around a pulley 52 supported on across member 53 interconnecting the extreme upper ends of thestanchions, The cable extends downwardly from the pulley and is securedto the hammer through the medium of a shock absorbing unit 54. The shockabsorbing unit 54 comprises a shaft 55 supported on the hammer andconnected to the free end 55 of the cable by means of the coil spring51. As shown in Figure 3, a U-shaped clip 58 is engaged with the shaft55 intermediate the ends of the latter, and the leg portions of the clipextend upwardly through the spring 51 and are bent over the upper end ofthe spring in the manner designated by the reference character 59. Asimilar clip 60 is assembled with the eye formed at the free end 56 ofthe cable, and the leg portions of this clip are extended downwardlythrough the spring and are bent over the lower end of the spring in themanner shown in Figure 4. With this arrangement, it will be apparentthat the free end of the cable is flexibly connected to the hammer bythe spring 51 and this is desirable in that it reduces the effect of theshock resulting from engagement of the hammer with the pavement.

From the foregoing, it will be noted that the equipment is actuated inthe same manner as any hoist. For example, when the operator desires toraise the hammer to its uppermost position. the lever 6I is manipulatedto clutch the drum shaft with the prime mover. This causes a rotation ofthe hoisting drum in a direction to wind the cable around the same and,as the cable is wound around the drum, the weight is moved in an up-Ward direction along the vertical stanchions. When the weight assumesthe desired elevation above the pavement to be broken, the operatormerely manipulates the lever 6| to release the drum from the primemover, permitting the weight to fall by gravity into engagement with thepavement. The weight may be held in a position spaced from the pavementby means of a pawl B2 pivotally supported on the frame I6 and adapted toengage a ratchet wheel 63 se'- cured to the hoisting drum. However, toavoid unduly tensioning the cable 5I during transporta tion of theequipment by the truck, I provide means in the form of a pin 55 forholding the hammer in a raised position. As shown in Figure 3,- the pin65 is removably supported in a pair of brackets 66 secured to the frameI6 and depending from the latter.

It will be noted from the above that I have Vprovided a compact, mobilepavement breaker composed of a relatively few parts and capable of beingreadily manufactured, assembled and installed. It should also beunderstood that all of the parts capable of being permanently securedtogether are preferably welded so as to provide an integralconstruction. In addition, it will be noted that my improved breakingequipment lends itself to application on a relatively small capacitytruck and may be installed on the latter without changing or interferingwith the standard construction of the truck chassis.

Iclaim: Y

1. In pavement breaking equipment, a frame, a vertical stanchionextending upwardly from the frame and comprising aligned sectionspivotally connected together to permit folding the upper section to aposition wherein the height of the stanchion is reduced an amountapproxin -mating the length of the upper section, and a weight slidablyengaging said stanchion.

2. In pavement breaking equipment, a frame, vertical stanchions havinglower sections fixed to the frame and having upper .sections foldablefrom an upright position in alignment with the lower sections to aposition wherein the height of the stanchions is reduced by an amountapproximating the length of the upper sections, and a weight slidablyengaging said stanchions.

3. In pavement breaking equipment, a. frame, vertical stanchions havinglower sections xed to the frame and having upper sections foldable froman upright position in alignment with the lower sections to a positionwherein the height of the stanchions is reduced by an amountapproximating the length. of the upper sections, means for securing theupper sections in an upright position, a hammer slidably engaging thestanchions, and means carried by the frame and connected to the hammerfor sliding the latter in an upward direction on said stanchions.

4. In pavement breaking equipment, a frame, vertical stanchions havinglower sections secured to the frame in lateral spaced relation and having upper sections in alignment with the lower sections, means hingedlyconnecting the upper and lower sections permitting the upper sections tobe folded to a position wherein the height of the stanchions is reducedby an amount approximating the length of the upper sections, a weightdisposed between the stanchions and slidably engaging the latter, andmeans for holding the upper sections in alignment with the lowersections.

5. In pavement breaking equipment, a frame, vertical stanchions havinglower sections secured to the frame in lateral spaced relation andhaving upper sections in alignment with the lower sections, meanshingedly connecting the upper and lower sections permitting the uppersections to be folded to a position wherein the height of the stanchionsis reduced by an amount approximating the length of the upper sections,a weight disposed between the stanchions and slidably engaging thelatter, means for holding the upper sections in alignment with the lowersections, and hoisting mechanism carried by the frame and operativelyconnected to the weight for moving the same upwardly on the stanchionsand operable to permit the weight to drop by gravity into engagementwith the pavement.

6. In pavement breaking equipment, a frame, a vertical stanchionextending upwardly from the frame and comprising aligned sectionspivotally connected together to permit folding the upper section to aposition wherein the height of the stanchion is reduced an amountapproximating the length of the upper section, and a weight slidablyengaging the upper and lower sections of the stanchion.

'7. An attachment for a truck comprising a frame, a vertical stanchionextending upwardly from the frame and comprising aligned sectionspivotally connected together to permit folding of the upper section to aposition wherein the height of the stanchion is substantially reduced,and a weight slidably engaging said stanchion.

8. An attachment for a truck comprising a frame, vertical stanchionshaving lower sections fixed to the frame and having upper sectionsfoldable from an upright position in alignment with the lower sectionsto a position substantially horizontal, a drop hammer guided by thestanchiens into engagement with the pavement upon which the truck issupported, and hoisting mechanism supported on the frame for actuatingthe drop hammer.

9. An attachment for a truck comprising a frame, a vertical stanchionhaving the lower section fixed to the frame and having an upper sectionfoldable from an upright position in alignment with the lower section toa position wherein the height of the stanchion is appre ciably reduced,means for securing the upper sec* tion in aligned relation to the lowersection, and a drop hammer guided by the stanchion into engagement withthe pavement upon which the truck is supported.

10. An attachment for a truck comprising a frame, a vertical .stanchionhaving a lower section fixed to the frame and having an upper sectionfoldable from an upright position in alignment with the lower section toa position substantially horizontal, means for securing the uppersection in aligned relation to the lower section, a drop hammer slidablyengaging said stanchionand guided by the latter into engagement with thepavementupon which the truck is supported, hoisting mechanism supportedon the frame, said hoisting mechanism including means for moving thedrop hammer upwardly along the stanchion, and means for disconnectingthe last named means to permit the hammer to drop by gravity intoengagement with the pavement.

11. An attachment for trucks comprising a frame, vertical stanchionshaving lower sections secured to the frame in lateral spaced relationand having upper sections in alignment with the lower sections, meanshingedly connecting the upper and lower sections permitting the uppersections to be folded to a position wherein the height of the stanchionsis appreciably reduced, means for securing the upper sections in alignedrelation to the lower sections, a drop hammer guided by the stanchionsfor movement into engagement with the pavement upon which the truck issupported, and hoisting mechanism cardirection on said stanchionincluding a hoisting mechanism supported on the frame, said mechanismhaving a hoisting drum and having a cable secured at one end to thehoisting drum, a pulley supported on the stanchion adjacent the upperend thereof and adapted to engage the other end portion of the cable,and yieldable means connecting the latter end of the cable to saidWeight.

CHARLES O. FINN.

